The use of proflavin-induced mutations (like FCO) in the rII genome was found to experimentally support a three-nucleotide explanation for the genetic code because:
A) an insertion mutation could be suppressed by a deletion mutation.
B) the rII genes are easier to mutate than other genes.
C) proflavin was an inexpensive mutagenic compound.
D) a gene with three insertions or three deletions could sometimes provide a functional protein.
E) the rII gene encoded a protein with exactly the correct number of amino acids,as would be explained by a three nucleotide genetic code.
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